Heat extractor



Feb. 9, 1937. B R FAUNCE 2,070,427

HEAT EXTRACTOR Filed May 22, 1935 ATTORNEY Patented Feb. 9, 1937 UNITEDSTATES- PATENT OFFICE HEAT nx'maoron.

Benjamin Rice Faunce, Riverside, N. J.

Application May 22,

6 Claims The object of this invention is to devise a novel heatextractor which can be connected in the discharge pipe line from aheater to recover heat units which would otherwise pass to the chimney.

A further object is to' devise a novel construction of a heat extractorwhich can be readily cleaned by the user.

With the above and other objects in view as 'will hereinafter moreclearly appear my invention comprehends a novel heat extractor.

Other novel features ofconstruction and advantage will hereinafter moreclearly appear in the detailed description and the appended claims.

For the purpose of illustrating the invention, I have shown in theaccompanying drawing a typical embodiment of it, which, in practice,will give satisfactory and reliable results. It is, however, to beunderstood that the various instrumentalities of which my inventionconsists can be variously arranged and organized, and my invention isnot limited to the exact arrangement and organization of theseinstrumentalities, as herein set forth.

Figure 1 is a sectional elevation of a heat extractor embodying myinvention.

Figure 2 is an end view of a deflector.

Figure 3 is a section on line 3-3 of Figure 1.

Figure 4 is an end elevation with a connector removed. a

Figure 5 is a detail on an enlarged scale of a deflector.

Figure 6 is a detail of a tube and reducer.

Figure '7 is a plan view of a Working tool.

Similar numerals indicate corresponding parts.

Referring to the drawing:-

l designates the outer shell of a heat extractor embodying my invention.The shell is preferably cylindrical but may have any desired contour incross section.

The shell is provided at the ends with the heads or closures 2 and 3which as illustrated are in the form of flanged discs welded or brazedto the shell. The shell I has a cold air inlet 4 and a hot air outlet 5which latter leads to a desired point of utilization such as for examplea hot air register in a room which is to be heated.

The heat extractor is connected to the smoke pipe for the exhaust gasesfrom the furnace or heater by the slip connectors B and I, which are infrictional engagement with the smoke pipe and the shell.

The products of combustion pass through the tubes 8 which pass throughthe heads 2 and 3 1935, Serial No. 22,735

and have a working fit in them, so that they can be withdrawn forcleaning purposes when desired.

In order to retard the passage of products of combustion through thetubes 8 and increase the amount of heat extracted, I insert in suchtubes the deflectors 9 which are in the form of flat copper stripstwisted upon themselves to form with the tubes circuitous paths for thepassage of the products of combustion.

The hottest portion of the gases will be at the upper portion of theshell, and I therefore provide for graduating the intake of gases to thetubes by providing closures Ill having difierent size openings I l andarranged so that the openings decrease in diameter towards the top ofthe head 3, for example. These closures are provided with a pin [2 in anofiset portion which is adapted to enter an aperture l3 at the intakeend of a tube. It will thus be apparent that the closures l0 can bereadily removed when it is desired to remove the deflectors 9. I alsopreferably insert between the tubes 8, air deflectors I4 similar to thedeflectors 9 and formed of flat twisted copper strips which arereinforced by the rods l5 secured thereto in any desired manner.

I provide a special tool for removing the deflectors 9 from the tubes 8.This tool consists of a tube l6 of greater diameter than a tube 8 andhaving threaded caps l l at the ends, and having hose connections l8 atthe ends. A wire I 9 passes through one cap and is provided with a hook20 to enter a hole 2| in a deflector 8 so that, when one cap is removed,the deflector 8 can be withdrawn into the tube IS, the cap replaced, andwater connections made with the hose connections l8 so that the soot andcarbon can be washed down the drain.

I have found in practice, that where a heat extractor embodying myinvention is used that, if a temperature of 600 F. is recorded at theinlet end of the extractor, the temperature drops to about 250 F. at thedischarge end of the extractor, thus proving that there is a largerecovery of heat units which would otherwise be wasted by passing to thechimney.

The heat extractor has a slip connection with the furnace pipe, so thatit can be removed and assembled by unskilled labor.

The slip connectors 8 and 1 can be readily removed irom and assembledwith the shell, so that the householder can clean the flues of the heatextractor without rendering it necessary to call in a heater repair man.

The air deflectors l4 are inserted between the tubes 8 as the latter areassembled with the heads sorbed by the air. They thus cause a bettermixture of the atmosphere and a more uniform heat extraction.

The closures Ill with their graduated openings are detachably connectedpreferably at the intake ends of the tubes 8, and openings II areselected which will give the best results with the specific stackpull-of the chimney to which the heat extractor is connected.

, The deflectors 9 due to their construction have been found inpractice, to be very eflicient in cleaning the tubes when they are drawnout of them.

It will now be apparent that I have devised a new and useful heatextractor which embodies the features of advantage enumerated asdesirable in the statement of the invention and the above description,and while I have, in the present instance," shown and describedpreferrred embodiments thereof which will give in practice satisfactoryand reliable results, it is to be understood that these embodiments aresusceptible of modification in various particulars without departingfrom the spirit or scope of the invention or sacrificing any of itsadvantages.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent is:

1. In a heat extractor, a shell having a cold air inlet, and a hot airoutlet, heads at the ends of the shell, tubes extending through saidheads, flat twisted heat absorbing strips in said tubes, closures at oneend of the tubes having difierent size openings and means to connectsaid extractor in the discharge line of a heater.

2. In a heat extractor, a shell having a cold air inlet and a hot airoutlet, heads closing the ends of the shell, tubes extending through theheads, closures at one end of the tubes having dlflerent size openingswhich decrease in diameter towards the top of the head, flat twistedheat absorbing strips in the tubes, heat absorbing members between thetubes, and means to connect the extractor in the discharge pipe line ofthe heater.

3. In a heat extractor, a shell having a cold air inlet and a hot airoutlet, heads closing the ends of the shell, tubes in the shellextending through the heads, means to cause a spiral movement of thegases passing through said tubes, removable closures detachably mountedon one end of predetermined tubes and having different size openingswith the smaller openings at the upper portion of the heat extractor andmeans to connect the extractor in the discharge line from a heater.

4. In a heat extractor; a shell having a cold air inlet and a hot airoutlet, heads closing the ends of said shell, tubes arranged one abovethe other in said shell and communicating through said heads, means tocause a. spiral travel to gases .passing through the tubes, means tograduate from the top to the bottom tubes the intake of gases thereto,and means to connect the heat extractor in the discharge line from theheater.

5. In a heat extractor, a shell having a cold air inlet and a, hot airoutlet, heads closing the ends of the shell, superimposed tubes in theshell and communicating through the heads, members having graduatedopenings removably mounted on the tubes at one end, and connectors atthe ends of the shell to connect it in the discharge pipe line of aheater.

6. In a heat extractor, a shell having a cold air inlet, and a hot airoutlet, heads closing the ends of the shell, tubes extending through theheads, flat twisted metallic members in the tubes, heat absorbingmembers between the tubes, means to graduate from top to bottom the pas-,sage of gases through said tubes, and connectors at the ends of theshell to connect it in the pipe line from a heater.

BENJAMIN RICE FAUNCE.

